Quite easy to string since it was flexible and its greasy surface reduced the friction when pulling the crosses.
Initially the Hawk provided a very direct feel, with very little dwell time. However after some time the string felt softer and started to show its real characteristics. After the initial break-in period, the Hawk was the most powerful string I've used for a long time, while still maintaining control (no trampoline etc.). Spin was above average for a non-textured string. The sound on impact was dampened but feedback was very good.
Overall I was quite happy with this string which - after breaking in - provided a really great package.

Hardly stretched during stringing. The string did not have any particular strength. The Panthera felt very direct from the start. Off-center hits imposed a significant shock on the arm and the sweetspot seemed small.
The main strings showed significant notches already after 20 minutes of play. Control was among the best characteristics of this string, while compared to other strings control was not extraordinary. Spin was pretty decent. The string seemed to have a special coating because after a few hits I noticed a slight wear on the strings which I had only seen on the Isospeed Professional previously.
The string broke after 1.5 hours of play in the center of the stringbed on a forehand shot.
For me there are better strings.

This time I tried the dark grey ("carbon") version, which seemed a lot different from the blue version that I found disappointing due to its dead feel. This one however feels great and provides a good package. Feel is rather dull, but not dead. I had extremely good touch with this string. I could really feel the ball in the stringbed. Power was a bit dominant vs. control, but not that I totally lacked control over my shots. I really enjoyed this string! Hardly any string movement. Although it started to notch quite quickly, it lasted a while (4.5 hours). I did not notice a significant tension loss during that time. Spin was quite good for a non-textured string. Tecnifibre seems to have improved the Razor Code - with success!

Interesting string with great feedback on impact. Great tension stability compared to other strings (no tension loss within the first hour after stringing, and constant playability throughout the test). Quite powerful with less control, but that can be compensated via spin. Feedback was nice and soft, with a certain cushioning effect. Durability of 4.5 hours is slightly above average for me.
Could be worth a test, although the price is rather high.

This string did not want to break, and it played consistently until the end. Very soft and comfortable from the start, resulting in good feedback. The sweetspot was unusually large, so off-center hits did not have a bad impact on the arm. The profile wore smooth after around 4 hours, but did not affect the spin potential that much. Power was good, but not extraordinary. Sometimes on hard strokes I had the impression that the string took some energy out of the shot, as if the dwell time was increased. The strengths of this string are its comfortable touch, good spin potential and good control.

The first thing that caught my eye was the black and white design of this string. Out of the package it had little recoil memory - the string seemed to relax somehow. Almost no stretch during stringing.
The stiff character was also evident on the court. It provided a very direct feedback, negatively affecting feel. Control was pretty good, so I would say that was the strength of this string. The sweetspot seemed very small, so you needed to hit the ball very precisely to generate power. After 2 hours of play, there were already significant notches, and after 3 hours the string broke in the center of the stringbed.
The main strings moved a lot and I had to straighten them after each rally. Spin was good but due to the lack of snap-back I think the spin could have been even better.
I think this string might be suitable for high level hard hitters since the sweetspot is quite small and the player needs to be able to generate the power.

There was nothing positive for me in this string. It was very stiff and board-like initially. Great power but little control. The strings started to move a lot quickly. I personally would not use this string again. Cut it out after 2 hours of play.

Due to the extremely poor durability I was not able to collect many impressions.
When you hit in the sweetspot, the string provides incredible power, but otherwise it doesn't. The sound on impact and the feedback are unique. The Nikita Soft almost plays as if it contained glass fiber. The only word I can think of to describe the feel is "glasslike". Very good control, and good spin for a non-textured poly.
Unfortunately the string broke after less than one hour in the center of the stringbed. That should not happen with a modern 1.25 mm poly.

The Savage is a rather stiff string, but it did not hurt my arm. Highlights of this string were control and spin potential. I was surprised by the good tension stability. The string seemed to maintain its characteristics throughout the entire test period. Even after 3 hours of play it felt like freshly strung. Shortly before it breaks, the main strings start to move a bit, which however doesn't influence the playing characteristics. I'm used to polys losing their playing characteristics towards the end of their life, getting softer, scattering and dead. But the Savage remained consistent. Excellent!
Overall I really enjoyed this string.

Very interesting string, feels like a blend of Solinco Tour Bite and Solinco Tour Bite Soft. The sharp edges grab the ball very well and do not wear round too quickly. Power is good but this is rather a control-oriented string. From the start the Durafluxx plays crisp and direct but not harsh.
After a few hours of play there are some notches. There is almost no string movement. The rate of the tension loss increases with time. At the time it broke (6.5 hours, in the center of the stringbed) it had lost all its resilience. But up to that point I enjoyed it and I'm sure it will find its fans. Try it!